.hello{
    text-align: center;
}
h3 {
    margin: 40px 0 0;
}
ul {
    list-style-type: none;
    padding: 0;
}
li {
    display: inline-block;
    margin: 0 10px;
}
a {
    color: #42b983;
}
.logo {
    margin-top: 20px;
    width: 200px;
    height: 200px;
}
.taskListTable{
    width: 800px;
    box-sizing: border-box;
    border-collapse: collapse;
}
.taskListTable th{
    height: 30px;
    line-height: 30px;
    background-color: #d4e6fb;
}
.taskListTable td{
    height: 24px;
    line-height: 24px;
}
button {
    cursor: pointer;
    font-size: 12px;
    margin: 10px;
    padding: 5px 10px;
    color: #ffffff;
    background-color: #4a90e2;
    border: 1px solid #4a90e2;
    border-radius: 100px;
}